package main

import "fmt"

const a = "a"
const b string = "b"

const (
	c string = "c"
	d        = true
)
const e, f = "啊", 100
const e_len = len(e)

const (
	aa = iota
	bb = iota
	_
	_
	cc = iota
)

func my_len(str string) int64 {
	return int64(len(str))
}
func main() {
	fmt.Print(a)
	fmt.Println(b)
	fmt.Println(c)
	fmt.Println(d)
	fmt.Println(e)
	fmt.Println(f)
	fmt.Println(e_len)
	fmt.Println(my_len(e))
	fmt.Println("________")
	fmt.Println(cc)
}
